I found the fix for flickering flash in firefox here. Disabling tooltips did it for me. Oh, and that thing about quitting firefox? Can’t do it. Yes, I was frustrated, and to a certain extent still am at times, but the other browsers are even more frustrating, i.e., less configurable/intelligent.
Oh, and the google search wiki fail? That went away when I installed this.
So, Firefox is once again my main browser.
Update: Oops! Posted too soon. Youtube videos still flicker, so I guess this belongs in the "Youtube sucks" category.